Ion conducting composite membrane materials containing an...

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H01M 8/10 (2006.01) H01M 2/16 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2479000

The invention provides composite membrane materials comprising a polymer of the state of art uniformly filled with a zirconium phosphate, preferably .alpha.-zirconium phosphate or zirconium phosphate sulfoarylenphosphonate particels. The composite membrane materials are preferably prepared starting from a solution of a polymer of the state of art and from a colloidal dispersion of .alpha.-zirconium phosphate or a zirconium phosphate sulfoarylenphosphonate. The colloidal particles are transferred into the solution of the polymer preferably by mixing the dispersion with the solution or by means of phase transfer. The membrane material is preferably obtained by removing the solvent by evaporation or by a suitable non-solvent. Besides the composite membrane materials and the preparation methods, the use of the above membrane materials is claimed as ionomeric membranes with high overall performance in high tempreature, especially hydrogen, and in indirect methanol fuel cells and with decreased methanol crossover in direct methanol fuel cells.

L'invention concerne des matériaux de membrane composite comprenant un polymère rempli uniformément par un phosphate de zirconium, de préférence, un phosphate d'.alpha.-zirconium, ou des particules de sulfoarylènephosphonate de phosphate de zirconium. Ces matériaux sont, de préférence, préparés à partir d'une solution polymère et d'une dispersion colloïdale de phosphate d'.alpha.-zirconium ou de sulfoarylènephosphonate de phosphate de zirconium. Ces particules colloïdales sont introduites dans la solution polymère, de préférence, par mélange de la dispersion et de la solution ou au moyen d'un transfert de phase. Ce matériau de membrane s'obtient, de préférence, par suppression du solvant par évaporation ou au moyen d'un non-solvant approprié. En plus de ces matériaux de ces membranes composites et de leurs procédés de préparation, elle concerne l'utilisation de ces matériaux sous forme de membranes ionomères de haute performance à température élevée, en particulier, dans des piles à combustible à hydrogène ou à méthanol indirect, tout en présentant une diminution de la transition méthanol dans des piles à combustible à méthanol direct.

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